Kore wa Sex ja Arimasen @ Gohoubi Ecchi

Suzu Tachibana is a college student whose hobby is to play with sex toys, and Kamiya is a man who develops sex toys as his job. Their relationship began with an agreement where Suzu would provide feedback on new products to Kamiya. Finally, Suzu's feelings has borne fruit (?). They see each other every day and have lots of sex. But then it's time for Suzu to start looking for a job, and...

(Source: Ichijinsha, translated)